湖泊化学碳酸盐与生物碳酸盐氧同位素组成差异的环境意义  

Environmental Significance of Oxygen Isotopic Composition Disparity between Co-existing Biogentic and Inorganical Carbonate Minerals

作　　者：曾承[1] 

机构地区：[1]阜阳师范学院历史文化与旅游学院,安徽阜阳236039

出　　处：《盐湖研究》2015年第2期15-19,共5页Journal of Salt Lake Research

基　　金：安徽省高校省级优秀青年人才基金重点项目(2013SQRW039ZD);安徽自然灾害过程与防控研究省级重点实验室开放基金(ZH201305);安徽省哲学社会科学规划项目(AHSKQ2014D56);阜阳师范学院科学研究项目(2014FSSK12);阜阳师范学院教学研究项目(2012JYXM54;2012JYXM77;2014JYXM53;2014JYXM24);阜阳师范学院"国培计划"项目校本研修课题(FYGP1408;FYGP1409)

摘　　要：湖泊生物碳酸盐形成于湖水底层,化学碳酸盐形成于湖水表层;处于湖积物同一层位的两种成因类型的碳酸盐氧同位素组成(δ18O)差异可能反映了二者形成时的环境差异,如湖泊不同深度的水温差异、碳酸盐质生物如介形类小生境水体δ18O值、两种成因碳酸盐形成的时间先后、湖泊表层水体蒸发情况等。在进行碳酸盐δ18O环境意义分析时,应分开测试生物碳酸盐和化学碳酸盐δ18O。The research results of Qinghai lake, Siling lake, palaeo-lake Zoige, and lake Zurich, indicate that the oxygen isotopic differences between co-existing benthic ostracods living on the lake bottom, and inorganical carbonate precipitated at the water surface, with the latter more negative, may be explained by the different water temperature, their seasonal difference in formation time δ^18O of bottom water microenvironment where ostracods live in, and the evaporation of water surface. The testing of single carbonate mineral δ^18O becomes the best choice whilst using carbonate δ^18O as one of the environment proxies for the study of regional climatic evolution.

关 键 词：化学碳酸盐 生物碳酸盐 氧同位素 方解石 

分 类 号：P597.2[天文地球—地球化学]